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Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 13,823 | $ 11,548
Loans Past Due Over 90 Days Still Accruing | 34 | 568
Non-Performing TDRs | 1,807 | 1,057
Performing TDRs | 3,491 | 2,002
Total Non-Performing Loans | 19,155 | 15,175
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 5,617 | 6,094
Loans Past Due Over 90 Days Still Accruing |  | 208
Non-Performing TDRs | 1,014 | 492
Performing TDRs | 1,562 | 109
Total Non-Performing Loans | 8,193 | 6,903
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,320 | 3,413
Non-Performing TDRs | 629 |
Performing TDRs | 139 | 109
Total Non-Performing Loans | 4,088 | 3,522
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 168 | 554
Non-Performing TDRs | 385 | 492
Total Non-Performing Loans | 553 | 1,046
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 140 | 68
Total Non-Performing Loans | 140 | 68
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,989 | 2,059
Loans Past Due Over 90 Days Still Accruing |  | 208
Performing TDRs | 1,423 |
Total Non-Performing Loans | 3,412 | 2,267
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 5,031 | 2,846
Loans Past Due Over 90 Days Still Accruing | 1 | 180
Non-Performing TDRs | 573 | 423
Performing TDRs | 1,607 | 1,558
Total Non-Performing Loans | 7,212 | 5,007
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 5,031 | 2,846
Loans Past Due Over 90 Days Still Accruing | 1 | 180
Non-Performing TDRs | 573 | 423
Performing TDRs | 1,607 | 1,558
Total Non-Performing Loans | 7,212 | 5,007
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,175 | 2,608
Loans Past Due Over 90 Days Still Accruing | 33 | 180
Non-Performing TDRs | 220 | 142
Performing TDRs | 322 | 335
Total Non-Performing Loans | 3,750 | 3,265
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 77 | 35
Total Non-Performing Loans | 77 | 35
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,121 | 916
Loans Past Due Over 90 Days Still Accruing | 33 | 173
Total Non-Performing Loans | 1,154 | 1,089
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,977 | 1,657
Loans Past Due Over 90 Days Still Accruing |  | 7
Non-Performing TDRs | 220 | 142
Performing TDRs | 322 | 335
Total Non-Performing Loans | $ 2,519 | $ 2,141

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